It is well known that stuck pipe releasing with acid soaking is the most rapid and effective way in Middle Tarim block of Tarim oilfield, a number of pipe sticking accidents have been solved with success rate of 100%. The sticking releasing operation in well TZ4SH is the first time to use acid soaking in non Ordovician strata with the carbonate content less than 90%. The practice shows that the acid soaking does not mean to completely dissolve the obstruction at the sticking point, but to partly dissolve obstruction to reduce the interference to drilling tool. For stuck pipe releasing with acid soaking, not only the lithology and the carbonate content in the sticking point should be learned, but also the cementing strength, borehole wall stability and some other factors should be considered.