Hydraulic technology has been mature since 1970s, but parameter in calculation, such as roughness parameter is hard to define automatically in project, so that automatic inversion of roughness parameter demands prompt solution.

This design bases on adaptive algorithm,and the application of adaptive nulling antenna,at last the power inversion algorithm is chosen taking account of the realizability and performance to supply null information for the system,in order to update the weights in the system,and the interferences can be restrained to a low level or delete from the received signals.

A multi-chain sampling method based on Metropolis-Hastings algorithm was used to improve the Markov Chain Monte Carlo(MCMC) method in order to prevent from trapped into the local optimal solutions that often occur to probability inversion by using current MCMC algorithm.