The isotherm adsorption and desorption test using the typical pedogenic horizons of cinnamon soil(cultivation horizon，leaching horizon，calcic horizon，argic horizon，and parent material)of Shanxi Province as the research object was adopted. The adsorption and desorption characteristics of soil phosphorus in different pedogenic horizons were studied through the adsorption and desorption values of phosphorus，the fitting curve of Langmuir equation and the correlation between the relevant parameters and soil properties. The results showed that:(1)Phosphorus adsorption capacity of different soil pedogenic horizons was calcic horizon>argic horizon>parent material>cultivation horizon>leaching horizon，and desorption capacity was leaching horizon>parent material>cultivation horizon>argic horizon>calcic horizon. The calcic horizon had the highest phosphorus fixation capacity and the lowest desorption rate. The desorption capacity and desorption rate of the leaching horizon were the highest.(2)There was a good fitness between the phosphorus adsorption curve and Langmuir equation(R2=0.9702-0.9980). The maximum phosphorus adsorption amount (Qm) of calcic horizon was 526.32 mg/kg. The adsorption constant(K) and maximum adsorption buffer capacity (MBC) values of the argic horizon were 0.24 and 78.74 mg/kg，respectively. The Qm，K and MBC values of the leaching horizon were 232.56 mg/kg，0.04 and 10.37 mg/kg，and they were all the minimum. The cultivation horizon had the highest adsorption saturation(DPS)(4.34%)，so it was at risk of phosphorus leaching.(3)The clay content was significantly positively correlated with the Qm and negatively correlated with the phosphorus DPS. The phosphoras DPS was significantly positively correlated with available phosphorus. The organic matter content was negatively correlated with soil adsorption binding energy. The results showed that characteristics of phosphorus adsorption and desorption in different soil pedogenic horizons of cinnamon soil region were different，and had obvious relationship with soil properties. The leaching risk of phosphorus in cultivation horizon was higher，and more attention should be paid to it.