You asked almost the same question already twice:

https://www.researchgate.net/post/What_are_the_precautions_used_for_tetra-primer_ARMS-PCR

https://www.researchgate.net/post/What_is_the_protocol_of_tetra-primer_ARMS-PCR

Se also:

https://www.researchgate.net/post/What_are_the_precautions_used_for_tetra-primer_ARMS-PCR

https://www.researchgate.net/post/Can_anybody_please_suggest_how_to_optimize_T-ARMS_PCR

thanks for you answer but the answers you pointed to it didn,t contain what i really want. so i repeated my question in another form

I'm have the experience to design tetra ARMS-PCR primers. This all contain 4 of primers (2 pair of primers) and it use for SNP genotyping. 

the percent of outer primer to inner primer 

I would say that, for the amount of primer that you should add, you need to optimize it first. For example I add just the four primers at 0.2 uM (same concentration) in the final concentration then perform the PCR and Gel electrophoresis to see the expected pcr product and then I estimate the primer concentration via the previous result and you should perform the PCR condition as a gradient as well (the annealing temp using between the four primer)

or you use this formula if the shorter product was to little RI/FO >1 and/or FI/RO >1  or  RI/FO