Taking taylor''s formula for example, the paper applied chaos partiele swarm optimization algorithm to analyze pumping test daga so as to slove the function optimization problem of parameters in aquifer. Through particle swarm optimization algorithm in the initial position and fine search process the chaotic sequence was added. The numerical experiment results show that the CPSO algorithms are effective to solve the aquifer parameter function optimization problem; the influence of particle increase on the convergence of chaos particle swarm optimization algorithms are not obvious; the initial value of conductivity selecting different multiples embodied that chaos particle swarm optimization algorithm is superior to the convergence of particle swarm optimization algorithms. To apply the CPSO algorithms to determining the aquifer parameters is feasible.