Once the car window is smashed by a thief, the following measures shall be taken after the alarm is given. If the car window is smashed by a thief, compensation shall be claimed from the person who smashed the car. If both parties cannot reach an agreement, they can file a lawsuit to the court, which will determine the amount of compensation. The general compensation expenses shall be paid in a lump sum; If it is really difficult to make a lump sum payment, it may be paid in installments, but corresponding guarantees shall be provided. According to relevant laws and regulations, those who intentionally destroy public or private property, if the amount is relatively large or if there are other serious circumstances, shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or a fine; If the amount is huge or if there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years.
 Legal basis
 Article 275 of the Criminal Law of the People's Republic of China [Crime of Intentional Destruction of Property] Whoever intentionally destroys public or private property, if the amount is relatively large or if there are other serious circumstances, shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or a fine; If the amount is huge or if there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years.