Abstract: The effects of inoculation with different AM isolates on the maize growth and P uptake in acidic soil were studied.The results show that there are significant differences among fungal species or ecotypes in mycorrhza formation,effectiveness and contribution to plant P uptake.About mycorrhiza formation,`BEG141'(isolated from France),`BEG168'(isolated from North China) and ‘BEG151’(isolated from South China) have higher colonization rate of 20% and ‘BEG167’(isolated from North China) follows,the ‘HAU-E4’ (isolated from Middle China) and ‘BEG150’ (isolated from South China) are the lowest.‘BEG150’ and ‘BEG168’ have markedly effect on the maize shoot biomass and plant growth, and no effect is performed by isolated ‘BEG151’ and ‘BEG141’, while ‘BEG167’ and ‘HAU-E4’ present a significant negative effect on the maize shoot biomass and plant growth. Except ‘BEG167’, all of the isolates are helpful to the P uptake, expecially ‘BEG168’ and ‘BEG141’. In terms of function, apart form ‘BEG167’ and ‘HAU-E4’, all other isolates can be used in acidic soil, and ‘BEG168’ and ‘BEG150’ are the most promising isolates to be applied on acidic soil.