This paper studies mainly to prepare nano-crystal nickel layer by pulse electro deposition and researched deeply the application in diamond tool manufacture. Through the dynamic analysis of pulse electro deposition mechanics ,it lies the basis of experiment. Through SEM,XRD and mechanic properties measure the texture structure and properties of nano-nickel layer are analysied and nano-Nickel layer is gotten, and on the basis of these parameters, the optimal parameters is found in manufacture diamond-tool. The main content and experiment results is following. l).Through pulse deposit mechanics and kinetics analysis, the process feasibility and primary influential factors are analysied.2).Through SEM and XRD analysis of pulse electro deposition layer, surface morphology, texture and grain size are studied. The analysis shows that micro-morphology is lumpy structure, appearing to orient prior to (111) crystal plate. Under the condition of T_(on) = 2ms,T_(off) =30ms, I_j =100A/dm~2, the grain size are 10.6nm and 7.6nm respectively. With the cycle duty is decreasing, the grain size is falling. 3).Through the measure of micro-hardness and stretch strength and the heat-treatment experiment, the results show that the biggest micro-hardness and stretch strength amount to 591Hv and 900MPa as 4 and 2.5 times as normal nickel layer respectively. The effect of pulse parameters on micro-hardness and stretch strength correspond to similar law, but different slightly. The heat-treatment experiment shows the change of layer micro-hardness has live up to the same law. This prove that the effect of pulse parameter on heat stability is very small.4).The optimal parameters are gotten by the method of perpendicular experiment. 5).The diamond tools are manufactured successfully using the previous process and parameters.