In this paper, plate-like nano-particles of strontium hydrogen phosphate (SrHPO4) with a thickness of 30 nm~80 nm and a width of 140 nm~200 nm were synthesized by chemical wet method. The influence of processing parameters including aging time, temperature, pH and concentration of solution, on composition, size and morphology of nano-particle was investigated by XRD and TEM. Results show that pH of reaction solution places a critical role on the composition of the final products. Both reaction time and temperature affect greatly morphology but little particle size.