Abstract: Double-delta technique is one of the most widely-used and actively-investigated multipath mitigation techniques in GNSS.It is significantly important to analyze the multipath mitigation performance of Double-delta technique in band-limited receiver channels,but seldom has it been referred in any former researches.The multipath error formula for Double-delta technique is derived for the first time after the introduction of tits basic theory.Three criteria,envelope peak,effective envelope length and envelope area,for multipath mitigation capability evaluation based on the multipath error envelope and their calculation formulae in infinite channel band are introduced.With these criteria,the multipath mitigation performance of Double-delta technique with different channel bandwidths are calculated and analyzed.It is drawn from the simulation that when the product of the correlator spacing and the single-side bandwidth is equal to one,the best multipath mitigation performance is achieved for Double-delta technique.