is the resistance will change with increase the negative charges in water
Your original question concerned deionized water. Do you mean tap water in this case?
I assume you have water in some sort of container.
If you charged the water it will have ions. The ions will reduce the resistance. This is counter to your observation.
Passing a current through water can cause dissolved or suspended material to plate on the walls of the container. The plated material is no longer in the water so will not act as charge carriers. The resistance will decrease. This is the case for both tap and deionized water. Deionized water will have ions from the ion-exchange process. Deionized water will have organic particles from the ion-exchange resin.
Clustering of suspended material is another process that may occur when current is applied to water. The resistance will decrease.
Someone at your university is likely performing voltammetry analysis. Learn that process and check your water.
Excuse me. There are errors in my reply. It should have read
Passing a current through water can cause dissolved or suspended material to plate on the walls of the container. The plated material is no longer in the water so will not act as charge carriers. The resistance will INCREASE. This is the case for both tap and deionized water. Deionized water will have ions from the ion-exchange process. Deionized water will have organic particles from the ion-exchange resin.
Clustering of suspended material is another process that may occur when current is applied to water. The resistance will INCREASE.
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