Chandi Parayana or Saptashati parayanam contains 700 Shlokas which is called Saptashati dedicated to goddess Durga Mata. Kavacha, Argala, Kilaka, Moola Stotra, Rahasya Traya, which amount to 7 is also a part of Chandi Parayana. The Saptashati Parayana contains thirteen chapters dedicated to Mahakali, Mahalakshmi, and Mahasaraswatiin the form of Purva charitra, Madhyama Charitra & Uttama charitra. These 13 chapters collectively contain 700 Shlokas that must be recited to complete Chandi Parayana / Chandi Homam.
The Shastras have prescribed Chandi Parayana of this Durga Saptashati one, ten, hundred or thousand times known as Chandi Parayana, Nava-Chandi Parayana, Shata Chandi Parayana and Sahasra Chandi Parayana respectively for the fulfillment of various wishes.