First of all, according to the "changing rooms during the year" recorded in House Layout (by Pan Changjun), it is estimated whether the owner is suitable for "changing doors" this year, because "changing doors" means that the pattern of houses will change, so we should first use the principle of "changing rooms during the year" to infer whether the owner is suitable for "changing doors" this year. If it is not suitable, then choose a suitable person at home to take charge of the work. If no one in the house is suitable for this year's "door change", according to the theory of "director of the Universiade" and "year of travel", everyone in the house can wear the corresponding swastika or Taiji diagram for customs clearance before construction.