The corrected coefficients for high frequence modulating (HFM) imaging formulas in holographic system are given. The exact results of the diffractive angle and coordinate value for imaging point can be obtained if corrected coefficient is used in these formulas to correct. The checking of results proved that the error in diffractive angle can be kept within 0.4 percent. The formulas of x3ν and y3ν which can be also computed simply from corrected coefficient as μ≤1 are given.