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Proposed a new computing MIE scattering coefficient algorithm. The algorithm uses the the improved backward recursive formula the Kext and scattering coefficients of the MIE coefficient of extinction coefficient K SCA accurate calculation. Since the new algorithm can significantly reduce the number of calculation cycle, thus significantly reducing the computation time. A more detailed discussion of the extensive use of the recursive method and continued fractions. And the calculation result of the new algorithm and the existing results were compared. The results indicate that: (1) calculation of the number of cycles and the complex refractive index of the particles is basically no relationship (2) Continued Fractions are usually the most accurate results (3) a new algorithm in the scaling coefficient is large (> 1000), calculated Time is only the Continued Fractions algorithm 10-2 to 10-3, the calculated error is less than 10-5 (4) algorithm is applicable to a wide range of the s