紫微斗數的主星和副星雜矅起好之後，會按不同時間安上主星四化，代表因時間引起主星發生變化，尤其在推斷人生不同時期的運勢變化，就需要四化這套工具。
四化不是單獨的主星或副星，而是依附在主星，描述主星產生不同變化的形容詞。有時四化被稱為四化星，可能只是為了方便，不應把四化當作獨立的星矅處理。
四化分為幾種，分別有按出生年天干所定的生年四化，一般寫在命盤之中。按大限命宮的天干所定的大限四化，還有按在日曆上的天干所定的流年四化，則引起每十年和每年的運勢起伏，一般都不寫在命盤上，須要熟記用來推斷，也可以用排盤程式生成的大限盤和流年盤，但四化體系較為常用，也很容易記住。當然這套四化系統，也可以套用在流月、流日、流時，作更仔細的推斷。
四化的分配如下：
為了方便記憶，也可以簡化為：
甲廉破武陽；
乙機梁紫陰；
丙同機昌貞；
丁陰同機巨；
戊貪陰陽機；
己武貪梁曲；
庚陽武府同；
辛巨陽曲昌；
壬梁紫府武；
癸破巨陰貪。
四化自然包含了四種主星的變化，分別為化祿、化權、化科及化忌，分別代表著事情發展的四個階段。化祿為起始階段，代表主星的特性增加和增多；化權為第二階段，事情開始後，就是收緊和集中的階段，這時人們集中研究事情的本義、初心、將矛頭指向正確的方向；化科為擴散的階段，化科帶有名聲散播開來，事情變得表面，形式化的意思；化忌是事情結束的階段，代表變異和變質，不再是原本的樣子了，變成另一回事了。
舉例來說，從前香港沒有西餐，起初有人把西餐傳到香港了，那是化祿的階段。由於西餐是特別的菜色，只集中在西餐廳提供，這是化權階段。慢慢西餐成為很多人喜愛的菜式，西餐廳愈開愈多，這是化科的階段。最後各種食肆都想提供西餐，於是茶餐廳做出湯通粉、西多士等變異了的西餐，來迎合香港人口味，反而成為了一種新口味新菜色，這是化忌的階段。
很多時坊間把祿權科當成佳化，化忌是唯一的壞事，又衍生出「三奇嘉會」這種特殊格局。一生不如意事十常八九，決不會只有四份之一這樣少，三方四正會照了化祿、化權和化科，不僅忽略了四化只是依附在主星的變化，不具有獨立的意義，還錯誤地以為祿權科就是好事，忌就是壞事。在上述例子中，沒有那一個階段絕對的好，也沒有絕對的壞，只是發生了不同的事情。
另外，不同紫微斗數門派流傳著不同的四化版本，這個中洲派版本一直使用也沒有發現問題，因此也沒有深究其他版本。若按此四化版本研究，可以細味一下當中的規律，相信一定埋藏了古人的智慧。舉例來說，不少主星都按著祿權科忌這四個階段演變，這年化祿，第二年就會化權，如此類推。我們做事情時，最起始時用了什麽態度或方法，很多時就按照四化的規律發展下去。例如尋找工作，一開始尋找很多空缺，那是機會很多的天機化祿，然後找緊其中一個機會就是天機化權，其他空缺自然就拒絕了，就成了天機化忌。又例如留意不同主星化祿的次序，可以發現甲年起都是思想型的工作開始，廉貞化祿是想出新的體制，天機化祿是很多新的機會，太陰化祿是計劃增加，都不是實在的事情。到戊年是貪狼化祿代表溝通增加，武曲化祿把計劃真正執行，太陽化祿更發展得更為廣泛。
四化是斗數中十分特別的體系，可以說是把命盤動起來，也是跟其他祿命術不同之處。
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