I think future studies is also called futurology and foresight v could predict what happen in future.. I think all are same meaning

I would categorize futurology as inventing the future and foresight as dealing with the future. The first aims to predict, whereas the second, at least in a strategy context, is about dealing with volatility, complexity and the unexpected. Inventing vs. enhanced decision making.

None of the terms imply predicting the future, but rather working to be futures ready. I define futures studies as the broad field, and foresight the innate capacity we all so have to think about the future.

Note that it's 'futures' not 'future', but there is no such thing as a linear future; rather there are many alternative futures, hence you can't predict the future in any way at all. Forecasting is a different matter, since there are some strong and persistent drivers of change that can be forecasted over the next 3 years or so. Beyond that, the level of uncertainty makes even forecasting a waste of time.

I work with organisations to build foresight capacity both in individuals and in the form of organisational processes. It involves the combination of changing how people think about the future, and changing how organisations deal with uncertainty/complexity/risk in their strategy processes.

And the less said about futurology, the better. It's a term that is usually used by amateurs; you won't find any foresight professional using it. You can find out more at my site (thinkingfutures.net), the Association of Professional Futurists (profuturists.org), or the World Future Society (wfs.org).

Regarding Maree Conway's observation:

"Note that it's 'futures' not 'future', but there is no such thing as a linear future; rather there are many alternative futures, hence you can't predict the future in any way at all. Forecasting is a different matter, since there are some strong and persistent drivers of change that can be forecasted over the next 3 years or so. Beyond that, the level of uncertainty makes even forecasting a waste of time."

Concur completely.

There is a propensity in government to write papers with 5 year leading projections, predictions, conjectures, and not necessarily with validated empirical evidence or reliable analysis. For example, the chaotic 'futures' that could be likely in geopolitical scenarios it is folly to attempt 'predicting' and stating ex cathedra in the absence of quantifiable evidence is like reading tea leaves.

In reading Global Trends 2030, one conjures questions rather than rational/plausible positions that might /could be useful to policymakers.

See source: 

http://www.dni.gov/index.php/about/organization/global-trends-2030

We argue that strategic/corporate foresight is a set of practices that enable firms to prepare to attain superior positions in markets of the future. Futures Research is concerned with exploring different, consistent and plausible futures. Other related terms are also 'peripheral vision' and 'environmental scanning'. See also:

Conference Paper Environmental scanning, futures research, strategic foresigh...

Article Corporate Foresight: An Emerging Field with a Rich Tradition

Futurology is a term out of use nowadays. It aims to forecast the future (The single future) and tries to "know the single future"! But the field of Futures Studies (with plural terms because tries to include plural futures and diverse approaches to the future) is the term used for academic discipline of studying the future, ant its main issues are based on philosophical, methodological and epistemological aspects of futures, and it focuses on long-term futures (in contrast to Foresight and Strategic Foresight). I define (Strategic)foresight as parctical filed of studying the future. As Sardar has mentioned foresight is Product-Oriented.

Strategic Foresight is used when we have competition and is related to Corporate Foresight. Many futurists use these two terms insteadly.