Abstract: The uniformity of spray deposition is one of the most important factors affecting spray quality. The effects of nozzle types, nozzle heights above targets and spray pressure on spray deposition uniformity were discussed. The test results showed that nozzle types and nozzle heights had significant effect on spray deposition uniformity. The optimum nozzle heights will be different with different types of nozzles. The effect of spray pressure on deposition uniformity,however, is not very significant.