A smartphone has very limited input methods regardless of its various functions. In this respect,it is one alternative that sensor motion recognition can make intuitive and various user interface. In thispaper, we recognize user’s motion using acceleration sensor, magnetic field sensor, and gyro sensor insmartphone. We try to reduce sensing error by gradient descent algorithm because in single sensor itis hard to obtain correct data. And we apply vector quantization by conversion of rotation displacementto spherical coordinate system for elevated recognition rate and recognition of small motion. After vectorquantization process, we recognize motion using HMM(Hidden Markov Model).