The way of encoded fringe projection is taken through projecting six binary fringe patterns after gray coding and four sinusoidal fringe patterns with the cycle of 2N - 1 into the object to unpack phase. This method achieved a measurement of object with steep edge, and improved the accuracy of phase unwrapping at the same time. Compared with traditional methods, this method can measure the step characteristics of object, and the measurement accuracy can be improved when high frequency fringe is projected.