CXT/10P-HA monitoring system is an alarming and recording device for tower crane which is suitable for any models of level-jib tower cranes. It provides the operator with the real-time working status of the tower crane accurately. If the load reaches 90% of the rated load, it will give an early warning. If it reaches 100%, it will alarm and if it reaches 105%, it will prevent the trolley automatically from moving outward and the hook from lifting upward thereby giving double protection to the tower crane.