The occurrence of ice-block in buried pipeline in high cold area will not only affect the transport efficiency

but also need massive manpower and resources to deal with.The precise of localization is very important.The sphere model is proposed to enhance the block and to generate sudden positive and negative pressure wave.The mutation of pressure is detected through the technique of wavelet transform which has well denoising ability and property in time-frequency.High localization precision is achieved through experimental verification.This technology is advanced and useful.