23 soils were collected from the croplands of 13 Chinese provinces. Their P leaching criterions were determined by laboratory experiments. Soil parameters including pH, organic matter, cation exchange capacity (CEC), <0.01mm, <0.002mm, exchangeable Ca and Mg, active Al and Fe, and P adsorption isotherm were measured at same time. The purpose of this work was to establish the relationships between the soil properties and the P leaching criterions obtained from the relationships between Olsen-P and CaCl₂-P. The results showed that the P leaching criterions increased exponentially with soil pH<6.0, but decreased with soil pH>6.0. The highest value was found at about soil pH6.5. There were close relationships between soil P leaching criterions and soil organic matter, active Fe (Al), exchangeable Ca. In general, exchangeable Mg, CEC, <0.01mm, <0.002mm, K and Q_m were not significantly related with P leaching criterions. However, the relationships were high in pH<6.0 soils. It is concluded that soil P leaching criterions can be estimated from either soil organic matter or active Fe (Al) contents. Accordingly, the tested 23 soils, except the paddy rice soil No. 20 from Qianjiang Hubei Province, had low risk of P leaching occurrence.