[Objective] In order to select the appropriate biochar for soil improvement and remediation, the physical and chemical properties of biochar produced from chicken manure, the enteromorpha and straw were compared, and the effect of biochar on capacity of soil water holding was also compared.[Methods] The biochars were produced at 350, 500 and 650℃ under anoxic condition. To investigate the impact on soil and properties of biochar produced from three types of biowaste, the elements analysis and pot experiments were performed.[Results] The element contents in three types of material were obviously different. The contents of carbon, hydrogen and ash in straw were higher than those of others. However, it was found that nitrogen content was higher in chicken manure, and carbon content was lower in enteromorpha but oxygen content was higher. Carbon content and nitrogen content of biochar produced from chicken manure were higher than those of the other two feedstocks, and carbon content of enteromorpha was lower. The H/C mole ratio of biochar was obviously lower than that of feedstock, and it decreased with the increase of pyrolysis temperature. However, the C/N mole ratio increased slowly with the increase of pyrolysis temperature. Moreover, it was found that the pH value of biochar produced from different feedstocks increases with pyrolysis temperature. The pH values increased from 6.82~8.35 to 9.33~10.29. Furthermore, the pH values increased as ash content increased. The pH values of biochar increased variously with the increase of ash content, for the three types of biochar, the increase rate ranked:straw > enteromorpha > chicken manure. It was also found that the water holding capacity of biochar produced from three types of feedstocks gradually improved with the increase of pyrolysis temperature.[Conclusion] Biochar produced from chicken manure behaved better than others did in nutrients providing and water holding capacity.